package com.sky.service.impl;

import com.alibaba.druid.sql.visitor.functions.If;
import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.dto.DishDTO;
import com.sky.dto.DishPageQueryDTO;
import com.sky.entity.Dish;
import com.sky.entity.DishFlavor;
import com.sky.entity.Setmeal;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.mapper.DishFlavorMapper;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealDishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.result.PageResult;
import com.sky.service.DishService;
import com.sky.vo.DishVO;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.ArrayList;
import java.util.List;

/**
 * TODO
 *
 * @author wxc
 * @date 2023/8/9 20:53
 */
@Service
public class DishServiceImpl implements DishService {

  @Autowired private SetmealDishMapper setmealDishMapper;

  @Autowired
  private SetmealMapper setmealMapper;

  @Autowired private DishFlavorMapper dishFlavorMapper;
  @Autowired private DishMapper dishMapper;
  /**
   * 新增菜品和对应的口味
   *
   * @param dishDTO
   */
  @Transactional
  public void saveWithFlavor(DishDTO dishDTO) {
    Dish dish = new Dish();
    BeanUtils.copyProperties(dishDTO, dish);

    // 向菜品表插入1条数据
    dishMapper.insert(dish);

    // 获取生成的主键id
    Long dishId = dish.getId();

    List<DishFlavor> flavors = dishDTO.getFlavors();
    if (flavors != null && flavors.size() > 0) {
      flavors.forEach(
          dishFlavor -> {
            dishFlavor.setDishId(dishId);
          });
      // 向口味表插入n条数据
      dishFlavorMapper.insertBatch(flavors);
    }
  }

  /**
   * 菜品分页查询
   *
   * @param dishPageQueryDTO
   * @return
   */
  public PageResult pageQuery(DishPageQueryDTO dishPageQueryDTO) {
    PageHelper.startPage(dishPageQueryDTO.getPage(), dishPageQueryDTO.getPageSize());
    Page<DishVO> page = dishMapper.pageQuery(dishPageQueryDTO);
    return new PageResult(page.getTotal(), page.getResult());
  }

  /**
   * 菜品批量删除
   *
   * @param ids
   */
  @Transactional
  public void deleteBatch(List<Long> ids) {
    // 判断当前菜品是否能够删除---是否存在起售中的菜品？？
    for (Long id : ids) {
      Dish dish = dishMapper.getById(id);
      if (dish.getStatus() == StatusConstant.ENABLE) {
        // =1 不能删
        throw new DeletionNotAllowedException(MessageConstant.DISH_ON_SALE);
      }
    }
    // 判断当前菜品是否能够删除---是否被套餐关联了
    List<Long> setmealIds = setmealDishMapper.getSetmealIdsByDishIds(ids);
    if (setmealIds != null && setmealIds.size() > 0) {
      // 不能删除
      throw new DeletionNotAllowedException(MessageConstant.DISH_BE_RELATED_BY_SETMEAL);
    }

    // 删除菜品表中的菜品数据
    for (Long id : ids) {
      dishMapper.deleteById(id);
      dishFlavorMapper.deleteById(id);
    }
  }

  /**
   * 根据id查询菜品
   *
   * @param id
   * @return
   */
  @Override
  public DishVO getByIdWithFlavor(Long id) {
    // 根据id查询菜品数据
    Dish dish = dishMapper.getById(id);
    // 根据菜品id查询口味数据
    List<DishFlavor> dishFlavors = dishFlavorMapper.getByDishId(id);

    // 将查询到的数据封装到VO
    DishVO dishVO = new DishVO();
    BeanUtils.copyProperties(dish, dishVO);
    dishVO.setFlavors(dishFlavors);
    return dishVO;
  }

  /**
   * 修改菜品
   *
   * @param dishDTO
   */
  @Override
  @Transactional
  public void updateWithFilter(DishDTO dishDTO) {

    Dish dish = new Dish();
    BeanUtils.copyProperties(dishDTO, dish);
    // 修改菜品表基本信息
    dishMapper.update(dish);
    // 删除原有口味
    dishFlavorMapper.deleteById(dishDTO.getId());
    // 重新插入
    List<DishFlavor> flavors = dishDTO.getFlavors();
    if (flavors != null && flavors.size() > 0) {
      flavors.forEach(
          dishFlavor -> {
            dishFlavor.setDishId(dishDTO.getId());
          });
      // 向口味表插入n条数据
      dishFlavorMapper.insertBatch(flavors);
    }
  }

  /**
   * 菜品起售和停售
   * @param status
   * @param id
   */
  @Override
  @Transactional
  public void startOrStop(Integer status, Long id) {
    Dish dish=Dish.builder()
            .id(id)
            .status(status)
            .build();
    dishMapper.update(dish);
    if (status==StatusConstant.DISABLE){
      List<Long> dishIds = new ArrayList<>();
      dishIds.add(id);
      List<Long> setmealIds = setmealDishMapper.getSetmealIdsByDishIds(dishIds);
      if (setmealIds !=null && setmealIds.size()>0){
        for (Long setmealId : setmealIds) {
          Setmeal setmeal = Setmeal.builder()
                  .id(setmealId)
                  .status(StatusConstant.DISABLE)
                  .build();
          setmealMapper.update(setmeal);
        }
      }
    }
  }

  /**
   * 条件查询菜品和口味
   * @param dish
   * @return
   */
  public List<DishVO> listWithFlavor(Dish dish) {
    List<Dish> dishList = dishMapper.list(dish);

    List<DishVO> dishVOList = new ArrayList<>();

    for (Dish d : dishList) {
      DishVO dishVO = new DishVO();
      BeanUtils.copyProperties(d,dishVO);

      //根据菜品id查询对应的口味
      List<DishFlavor> flavors = dishFlavorMapper.getByDishId(d.getId());

      dishVO.setFlavors(flavors);
      dishVOList.add(dishVO);
    }

    return dishVOList;
  }

  /**
   * 根据分类id查询菜品
   * @param categoryId
   * @return
   */
  public List<Dish> list(Long categoryId) {
    Dish dish = Dish.builder()
            .categoryId(categoryId)
            .status(StatusConstant.ENABLE)
            .build();
    return dishMapper.list(dish);
  }

}
